Package org.xerial.snappy

Class SnappyInputStream

java.lang.Object

java.io.InputStream

org.xerial.snappy.SnappyInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class SnappyInputStream
extends java.io.InputStream

A stream filter for reading data compressed by SnappyOutputStream.

Field Summary

Fields

Modifier and Type	Field	Description
private byte[]	compressed
private boolean	finishedReading
private byte[]	header
protected java.io.InputStream	in
static int	MAX_CHUNK_SIZE
private int	maxChunkSize
private byte[]	uncompressed
private int	uncompressedCursor
private int	uncompressedLimit

Constructor Summary

Constructors

Constructor	Description
SnappyInputStream(java.io.InputStream input)	Create a filter for reading compressed data as a uncompressed stream
SnappyInputStream(java.io.InputStream input, int maxChunkSize)	Create a filter for reading compressed data as a uncompressed stream with provided maximum chunk size

Method Summary

Modifier and Type	Method	Description
int	available()
void	close()	Close the stream
protected boolean	hasNextChunk()
private static boolean	isValidHeader(byte[] header)
int	rawRead(java.lang.Object array, int byteOffset, int byteLength)	Read uncompressed data into the specified array
int	read()	Reads the next byte of uncompressed data from the input stream.
int	read(byte[] b, int byteOffset, int byteLength)	Reads up to len bytes of data from the input stream into an array of bytes.
int	read(double[] d)	Read double array from the stream
int	read(double[] d, int off, int len)	Read double array from the stream
int	read(float[] d)	Read float array from the stream
int	read(float[] d, int off, int len)	Read float array from the stream
int	read(int[] d)	Read int array from the stream
int	read(int[] d, int off, int len)	Read int array from the stream
int	read(long[] d)	Read long array from the stream
int	read(long[] d, int off, int len)	Read long array from the stream
int	read(short[] d)	Read short array from the stream
int	read(short[] d, int off, int len)	Read short array from the stream
protected void	readFully(byte[] fragment, int fragmentLength)
protected void	readHeader()
private int	readNext(byte[] dest, int offset, int len)	Read next len bytes

Methods inherited from class java.io.InputStream

mark, markSupported, nullInputStream, read, readAllBytes, readNBytes, readNBytes, reset, skip, transferTo

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MAX_CHUNK_SIZE

public static final int MAX_CHUNK_SIZE

See Also:

Constant Field Values

finishedReading

private boolean finishedReading

in

protected final java.io.InputStream in

maxChunkSize

private final int maxChunkSize

compressed

private byte[] compressed

uncompressed

private byte[] uncompressed

uncompressedCursor

private int uncompressedCursor

uncompressedLimit

private int uncompressedLimit

header

private byte[] header

Constructor Detail

SnappyInputStream

public SnappyInputStream(java.io.InputStream input)
                  throws java.io.IOException

Create a filter for reading compressed data as a uncompressed stream

Parameters:

input -

Throws:

java.io.IOException

SnappyInputStream

public SnappyInputStream(java.io.InputStream input,
                         int maxChunkSize)
                  throws java.io.IOException

Create a filter for reading compressed data as a uncompressed stream with provided maximum chunk size

Parameters:

input -

maxChunkSize -

Throws:

java.io.IOException

Method Detail

close

public void close()
           throws java.io.IOException

Close the stream

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException

readHeader

protected void readHeader()
                   throws java.io.IOException

Throws:

java.io.IOException

isValidHeader

private static boolean isValidHeader(byte[] header)
                              throws java.io.IOException

Throws:

java.io.IOException

readFully

protected void readFully(byte[] fragment,
                         int fragmentLength)
                  throws java.io.IOException

Throws:

java.io.IOException

read

public int read(byte[] b,
                int byteOffset,
                int byteLength)
         throws java.io.IOException

Reads up to len bytes of data from the input stream into an array of bytes.

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

rawRead

public int rawRead(java.lang.Object array,
                   int byteOffset,
                   int byteLength)
            throws java.io.IOException

Read uncompressed data into the specified array

Parameters:

array -

byteOffset -

byteLength -

Returns:

written bytes

Throws:

java.io.IOException

read

public int read(long[] d,
                int off,
                int len)
         throws java.io.IOException

Read long array from the stream

Parameters:

d - input

off - offset

len - the number of long elements to read

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

java.io.IOException

read

public int read(long[] d)
         throws java.io.IOException

Read long array from the stream

Parameters:

d -

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

java.io.IOException

read

public int read(double[] d,
                int off,
                int len)
         throws java.io.IOException

Read double array from the stream

Parameters:

d - input

off - offset

len - the number of double elements to read

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

java.io.IOException

read

public int read(double[] d)
         throws java.io.IOException

Read double array from the stream

Parameters:

d -

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

java.io.IOException

read

public int read(int[] d)
         throws java.io.IOException

Read int array from the stream

Parameters:

d -

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

java.io.IOException

read

public int read(int[] d,
                int off,
                int len)
         throws java.io.IOException

Read int array from the stream

Parameters:

d - input

off - offset

len - the number of int elements to read

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

java.io.IOException

read

public int read(float[] d,
                int off,
                int len)
         throws java.io.IOException

Read float array from the stream

Parameters:

d - input

off - offset

len - the number of float elements to read

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

java.io.IOException

read

public int read(float[] d)
         throws java.io.IOException

Read float array from the stream

Parameters:

d -

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

java.io.IOException

read

public int read(short[] d,
                int off,
                int len)
         throws java.io.IOException

Read short array from the stream

Parameters:

d - input

off - offset

len - the number of short elements to read

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

java.io.IOException

read

public int read(short[] d)
         throws java.io.IOException

Read short array from the stream

Parameters:

d -

Returns:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws:

java.io.IOException

readNext

private int readNext(byte[] dest,
                     int offset,
                     int len)
              throws java.io.IOException

Read next len bytes

Parameters:

dest -

offset -

len -

Returns:

read bytes

Throws:

java.io.IOException

hasNextChunk

protected boolean hasNextChunk()
                        throws java.io.IOException

Throws:

java.io.IOException

read

public int read()
         throws java.io.IOException

Reads the next byte of uncompressed data from the input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

available

public int available()
              throws java.io.IOException

Overrides:

available in class java.io.InputStream

Throws:

java.io.IOException